Configured for non-contacting vibration and displacement measurement in 3300 XL monitoring platforms, the Bently Nevada 330705-02-18-10-02-05 (330705-02-18-10-02-05 Proximity Probe) provides direct physical/electrical execution for monitoring radial and axial shaft motion.

Suffix Configuration Matrix

The 330705 series utilizes a standardized coding system to define mechanical and electrical properties. The configuration -02-18-10-02-05 specifies the physical length, mounting thread dimensions, connector type, and material composition required for reverse-mount installations in specific turbomachinery housing interfaces.

Technical Hardware Specifications

Transducer Electrical Integrity

Optimal performance requires precise eddy-current probe scaling to ensure linear voltage output corresponding to the target gap. Users must verify gap voltage validation (-10 VDC targets) at the Proximitor sensor output during commissioning to ensure the system operates within the calibrated linear range. High-frequency rotor dynamics data acquisition depends on the suppression of electromagnetic noise; therefore, cross-talk suppression is achieved by ensuring the coaxial shielding remains continuous and is grounded exclusively at the monitor end to eliminate ground loop currents.

Standard Ordering Inclusions

• 330705-02-18-10-02-05 Proximity Probe

• Integral coaxial cable with protective connector

• Stainless steel mounting nuts

• Technical installation manual

Field Installation Protocols

• Surface Preparation: Ensure the target shaft area is free of scratches, burrs, or surface coatings that could affect eddy-current field uniformity.

• Mechanical Mounting: Tighten the probe body into the mounting bracket until it makes contact with the shaft, then back off to the desired gap distance as specified in the machine manual.

• Connector Handling: Protect the coaxial connector from moisture and contaminants using the included caps until final integration.

• Shielding: Ensure the cable path is secured using insulated clamps to prevent abrasion and mechanical stress on the coaxial dielectric.

• Impedance Matching: Verify the total system length matches the 5 m or 9 m Proximitor calibration to avoid phase shift errors in the monitored signal.

Logistics and Transit

• Delivery time: 3-5 days when payment finish.

• Dispatched via DHL/FEDEX/UPS.

• All components are secured within anti-static industrial packaging to protect against ESD and mechanical impact.

Technical FAQs

• Can this probe be used in 3300 standard (non-XL) systems? No, 3300 XL components are specifically calibrated for 3300 XL Proximitor sensors; intermixing series will cause measurement errors.

• What is the effect of probe tip damage? Minor scratches on the PPS tip generally do not affect readings, but structural damage will invalidate the calibration curve.

• Is the cable length field-adjustable? No, the length is fixed at the factory. Cutting the cable changes the system capacitance and renders the sensor inaccurate.

• How do I identify a ground loop? High-frequency 50/60 Hz interference observed on the vibration signal usually indicates a ground loop or improper shield termination.

• Can it be used in hydrogen-cooled environments? Yes, the materials are compatible with standard hydrogen-cooled generator environments.

• Why is reverse mounting used? It is required when physical access to the probe mounting point is only available from the inside of the machine casing.

• How is sensitivity maintained? Sensitivity is fixed at 200 mV/mil (7.87 V/mm) and is maintained by the matched Proximitor-Probe-Cable set.

• Does orientation matter for radial measurement? Probes should be installed at 45 degrees relative to the vertical centerline for optimal journal bearing analysis.